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US ZIP Code Profile

ZIP Code 40204
Louisville, Kentucky

ZIP code 40204 is in Louisville, located in Jefferson County, Kentucky, within the Louisville/Jefferson County metro area. Its 2020 Census population was 14,600. The estimated median adjusted gross income per tax return is $53,365, and about 10% of filers report $200,000 or more.

2020 Population
14,600
Census ZCTA
County
Jefferson
FIPS 21111
Median income (est.)
$53,365
IRS SOI 2022
Land Area
3.245 mi²
+ 0.046 mi² water

01Location & Geography

Authoritative geographic identifiers from the U.S. Census Bureau, ANSI, and FIPS standards.

Primary CityLouisville, KY
CountyJefferson County (FIPS 21111)
StateKentucky (FIPS 21)
Metro Area (MSA)Louisville/Jefferson County, KY-IN Metro Area (31140)
Census Region / DivisionSouth Region · East South Central Division
Coordinates38.239914, -85.72159
Land / Water Area3.245 mi² land · 0.046 mi² water

02Income & Economics

Distribution of the 7,230 individual tax returns filed in 40204 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
21.6%
$25K–$50K
26.0%
$50K–$75K
18.0%
$75K–$100K
10.0%
$100K–$200K
14.7%
$200K+
9.8%
The $200,000+ bracket accounts for 48% of 40204's total adjusted gross income, from 10% of returns — a concentration that drives the gap between the median ($53,365) and the average.
Estimated median = median adjusted gross income per tax return, interpolated from IRS SOI brackets. Differs from U.S. Census household income.

03Income Over Time

Year-over-year change in 40204's IRS income metrics, 2020–2022.

Median income (2021→2022)
$53,365
▲ 7.8%
Filers earning $200K+
9.8%
▲ 0.4 pt
Total filers
7,230
▼ 1.0%
GET /zipc/v2/zipcodes/40204/soi?year=… $45K 2020 $49K 2021 $53K 2022
Median = adjusted gross income per return, interpolated from IRS SOI brackets. Figures are nominal (not inflation-adjusted).

04Population Trend

Decennial U.S. Census population for the 40204 ZCTA.

2000
14,953
 
2010
14,236
▼ -4.8%
2020
14,600
▲ +2.6%

05Nearby ZIP Codes — Live Radius Search

Drag the slider to filter ZIP codes by distance from 40204. Powered by the same radius endpoint developers call from the API.

GET /zipc/v2/radius

ZIP codes within range of 40204

Louisville and its immediate neighbors, sorted by distance.

3 mi
GET /zipc/v2/distance

Distance from 40204 to any ZIP

Enter a 5-digit ZIP to calculate the distance.

06USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortD
USPS Finance Number204788
City AliasesLouisville

07Frequently Asked Questions

What county is ZIP code 40204 in?

ZIP code 40204 is in Jefferson County, Kentucky (county FIPS code 21111).

What city is ZIP code 40204?

The primary USPS city for 40204 is Louisville, KY.

What metro area (MSA) is 40204 in?

40204 is part of the Louisville/Jefferson County, KY-IN Metro Area (MSA code 31140).

What is the population of ZIP code 40204?

The 2020 Census population of 40204 was 14,600 residents.

What is the median income in ZIP code 40204?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 40204 is about $53,365, with around 10% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.